Accessories
9.4 Surge suppressor
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
302 Manual, 09/2017, A5E03656507120A/RS-AE/006
Technical background information
The oscillograms below show what happens when contactor coils are disconnected without
and with overvoltage attenuation.
Figure 9-8 Disconnection of a contactor coil without RC circuit
Oscillogram of the disconnection of a contactor relay coil; the coil does not have an RC
circuit: Shower discharges are clearly visible (voltage peaks up to several kV). Once the
disconnection process has started, the shower discharges occur for about 250 μs; after that,
the vibration is simply damped.
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